Darkvision and Half-Dragon breath weapon as Epic Boon

[SheerANONYMOUS]

I'm trying to put together an Epic Boon that gives the player a Half-Dragon's breath weapon and vision abilities, but I'm running into an issue. Both are showing up greyed out, with the breath weapon being listed in the Special tab as "Not Equipped." How can I fix these?

Also, ideally this Boon would be restricted to Dragonborn, so how can I set it up to only be selectable by that race, and replace the Dragonborn's breath weapon completely?